Measurement of $Z+b$ jet production at D0

The inclusive $Z+b$ jet production is an important background to searches for the Higgs boson in associated $ZH$ production at the Fermilab Tevatron collider. We present measurements of the ratio of inclusive cross sections for $p\bar{p}\rightarrow Z+b$ jet to $p\bar{p}\rightarrow Z+$ jet production as well as the inclusive $Z+b$ jet cross section. The measurements use a data sample from $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV corresponding to an integrated luminosity of 6.2 fb$^{-1}$ collected by the D0 detector. $Z$ bosons are selected in the electron and muon decay modes. Events containing a $Z$ plus at least one $b$ jet are discriminated from $Z+$charm and light jet(s) events by a novel technique that exploits the properties of the tracks associated to the jet. The measurements are compared with the next-to-leading order theoretical predictions.